Update docusaurus.config.js (#4308)

update docs banner to live demos

## What are you changing in this pull request and why?
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Describe your changes and why you're making them. If linked to an open
issue or a pull request on dbt Core, then link to them here! 

To learn more about the writing conventions used in the dbt Labs docs,
see the [Content style
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## Checklist
<!--
Uncomment if you're publishing docs for a prerelease version of dbt
(delete if not applicable):
- [ ] Add versioning components, as described in [Versioning
Docs](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#versioning-entire-pages)
- [ ] Add a note to the prerelease version [Migration
Guide](https://github.com/dbt-labs/docs.getdbt.com/tree/current/website/docs/guides/migration/versions)
-->
- [ ] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
and [About
versioning](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#adding-a-new-version)
so my content adheres to these guidelines.
- [ ] Add a checklist item for anything that needs to happen before this
PR is merged, such as "needs technical review" or "change base branch."

Adding new pages (delete if not applicable):
- [ ] Add page to `website/sidebars.js`
- [ ] Provide a unique filename for the new page

Removing or renaming existing pages (delete if not applicable):
- [ ] Remove page from `website/sidebars.js`
- [ ] Add an entry `website/static/_redirects`
- [ ] [Ran link
testing](https://github.com/dbt-labs/docs.getdbt.com#running-the-cypress-tests-locally)
to update the links that point to the deleted page

website/docusaurus.config.js

@@ -71,13 +71,13 @@ var siteSettings = {
     announcementBar: {
       id: "biweekly-demos",
       content:
-        "Register now for Coalesce 2023. The Analytics Engineering Conference!",
-      backgroundColor: "#7444FD",
+        "Join our weekly demos and dbt Cloud in action!",
+      backgroundColor: "#047377",
       textColor: "#fff",
       isCloseable: true,
     },
     announcementBarActive: true,
-    announcementBarLink: "https://coalesce.getdbt.com/",
+    announcementBarLink: "https://www.getdbt.com/resources/dbt-cloud-demos-with-experts?utm_source=docs&utm_medium=event&utm_campaign=q1-2024_cloud-demos-with-experts_awareness",
     // Set community spotlight member on homepage
     // This is the ID for a specific file under docs/community/spotlight
     communitySpotlightMember: "faith-lierheimer",